Some explanation on the explosion part at least... talked to my brother today about it. Seems this story is starting to make the rounds in the fire service although the investigation is still not comlete. According to him, smoke is simply airborn unburned fuel and cutting a door off its hinges with a chopsaw is enough to ingnite the fine particulate matter in smoke with results similar to a grain silo explosion. It can be quite violent. More information to follow, as it becomes available, although I am not sure fire departments are as concerned with the electrical angle vs the firefighting/safet angle on episodes like this, but still something of interest to us here might come out of it.
